A ball is thrown directly downward with an initial speed of 7.70 m/s, from a height of 30.2 m. After what time interval does it strike the ground?

Explanation:

Given

-- initial velocity

--- height

Required

Determine the time to hit the ground

This will be solved using the following motion equation.

Where

So, we have:

Subtract 30.2 from both sides

Solve using quadratic formula:

Where

Split the expression

or

or

Time can't be negative;  So, we have:

Hence, the time to hit the ground is 1.82 seconds

i think it's 35 meters

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas